JPH0754981B2 - Reception display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving / displaying device for character / graphic information such as teletext.

2. Description of the Related Art Conventionally, when a channel of a receiving broadcast station is changed, a teletext decoder detects it by a change of a transmission identification number included in a teletext signal.

FIG. 3 shows a conventional reception display device. Reference numeral 1 is an antenna for receiving broadcast waves, and 2 is a television signal receiving / demodulating unit for receiving and demodulating an input from the antenna 1. After receiving and demodulating a television signal, an audio signal (A1) and an R, G, B signal as a video signal are generated. (R
Outputs 1), (G1), (B1), etc. R is red,
G indicates green, B indicates blue, and so on. Further, a video signal and a sync signal are also output. A first key input unit 3 is operated when inputting a receiving channel and the like.
A key input processing unit 4 processes the key input data from the first key input unit 3 to instruct the television signal receiving / demodulating unit 2 to change the channel. Reference numeral 5 is a teletext decoder, which extracts the teletext signal from the above video signal, creates a text and graphic signal and additional sound from the extracted data, and synchronizes with the above synchronization signal (R2), (G2), (B2)
It outputs video signals and audio signals (A2). A second key input unit 6 is used to input a key for utilizing teletext. Reference numeral 7 processes the key signal from the second key input unit 6 and gives an instruction to the teletext decoder 5. The teletext decoder 5 outputs a Ys signal for switching RGB video signals, an AV signal for switching video signals and audio signals, and the like. Further, 8 is a video / audio switching section, which is a video signal and audio signal (A1) such as (R1), (G1), and (B1) from the TV signal receiving and demodulating section 2 and (R2) from the teletext decoder 5. , (G2), (B2) and other video signals and audio signals (A2) are switched by the Ys signal and AV signal described above, and (R3), (G3), (B3) video signals such as CRT The audio signal (A3) is output to the display unit 9 including a display, and is output to the audio output unit 10 including a speaker.

In the conventional configuration as described above, when a character broadcast of a different broadcasting station is used while using the character broadcast, a new channel number is input from the first key input unit 3. The key data of this channel number is processed by the input processing unit 4, and the television signal reception demodulation unit 2 receives and demodulates the radio wave of the broadcasting station of the designated channel. Then, the video signal of the newly received station is output to the teletext decoder 5. The teletext decoder 5 extracts teletext data from the video signal, detects the transmission identification number from the extracted data, compares it with the previously detected transmission identification number, confirms that there is a difference, and confirms the contents of the new station's teletext. Data is taken in, and a message indicating that a table of contents is being searched for is displayed on the screen of the display unit 9, and the table of contents screen is displayed after the table of contents screen data has been acquired and processed.

Even when a character broadcast reception request is first made after the power is turned on, similarly, at that time, the character broadcast table of contents data superimposed on the video signal from the television signal reception demodulator 2 is taken in and the same processing as described above is performed. Do.

Problems to be Solved by the Invention When a channel of a teletext user is switched to watch a teletext of a broadcasting station of a different channel, the text / graphic screen of the old channel is conventionally displayed on the display. A message indicating that the contents are being searched is displayed after a while, and if a teletext is being transmitted on that channel, a screen showing the contents of the contents is displayed after that.

Further, in the past, when searching for a table of contents, it was not possible to display on the screen which broadcast station the table of contents was searched for, which was not convenient for the user.

In addition, the teletext decoder must always determine the transmission identification number as an internal process regardless of channel switching, resulting in a decrease in processing efficiency.

The present invention eliminates the contradiction on the display when the channel is switched while receiving the teletext, and promptly displays to the viewer which telecasting table of contents the telecasting user is looking for. It is an object of the present invention to provide a reception display device that can improve the ease of operation and the processing efficiency of a teletext decoder.

Means for Solving the Problems A reception display device of the present invention is a television signal reception demodulation unit that receives and demodulates a television broadcast and outputs various signals such as a video signal, an audio signal, a video signal, a synchronization signal, and the video. The character broadcasting signal is extracted from the signal, processed as character and graphics and processed as additional sound, and output as a video signal and an audio signal.The video signal and audio signal from the TV broadcasting side and the video signal and audio signal from the character broadcasting side are selected. It stores a teletext decoder unit that outputs a switching signal that specifies switching, a key input processing unit and a key input unit that makes a key request to the television signal reception demodulation unit and the teletext decoder unit, and stores a television broadcasting channel. The channel register accessible from the key input processing unit and the channel data from the key input processing unit are temporarily stored and are stored in the teletext decoder unit. Accessible channel buffer, message storage for storing message data displayed on the screen and accessible from the teletext decoder, and video / audio switching for switching video signals and audio signals to either the TV broadcast side or the teletext side. When the power is turned on, the channel number data stored in the channel register is sent to the teletext decoder when the channel is switched, and the teletext decoder holds it in the channel buffer each time. It is characterized in that the data in the message storage section is immediately decoded by the teletext decoder to display on the screen that the channel has been switched and the channel that has been switched is displayed.

Operation According to this configuration, the key input section and the key input processing section are shared by the television signal reception demodulation section and the teletext decoder, and the channel number data stored in the channel register is teletext when the power is turned on or the channel is switched. It is sent to the decoder, and the teletext decoder holds the channel number data in the channel buffer each time, and when the teletext is in use, the channel number and the fact that the table of contents is being searched are displayed immediately on the screen.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, the same reference numerals are given to those having the same operation as in FIG. 3, and the description thereof will be omitted.

FIG. 1 shows a receiving and displaying apparatus of the present invention, which is different from FIG. 3 in the following points. That is, in FIG. 1, the common key input unit 15 and the key input processing unit 11 are provided for the television signal reception demodulation unit 2 and the teletext decoder 13, the configuration of the teletext decoder 13 and the teletext decoder. 13 is greatly different in that a message ROM 16 and a channel buffer 14 which are not included in the teletext decoder 5 are connected.

FIG. 1 will be described in more detail. After the power is turned on, the key input processing unit 11 reads the channel number stored in the channel register 12 and sends the channel number data to the television signal reception demodulation unit 2 and the teletext decoder 13. The television signal reception demodulation unit 2 receives the requested channel number and outputs video signals such as audio signals (A1) and (R1), (G1), (B1), and also sends out video signals and synchronization signals. This is the same as before.

In addition, the configuration of the teletext decoder 13 is such that the teletext signal is extracted from the video signal of the television signal reception demodulation unit 2, the text and graphic signal and the additional sound are created from the extracted data, and the text signal is synchronized with the above-mentioned synchronization signal (R2 ), (G2), (B2), etc. are the same as the teletext decoder 5 in FIG. 3 in that they output video signals and audio signals (A2), but the following points are different from the teletext decoder 5. ing. Teletext decoder 13
Detects the channel number data from the key input processing unit 11 and stores it in the channel buffer 14. After that, when the key for displaying the teletext is pressed from the key input unit 15, the key input processing unit 11 sends the instruction data to the teletext decoder 13. Immediately after detecting the data, the teletext decoder 13 sends out a message indicating the channel number stored in the channel buffer 14 and the contents search stored in the message ROM 16 as a video signal, and the Ys signal and the AV signal The video / audio switching unit 8 is switched to the teletext decoder 5 side, and video signals and audio signals (A3) such as (R3), (G3) and (B3) are output to the display unit 9 and the audio output unit 10. FIG. 2 shows a screen display example in this case.

As described above, in the reception display device of the present invention, the key input unit and the key input processing unit are shared by the television signal reception demodulation unit and the teletext decoder, and the channel of the broadcasting station is set in the key input processing unit. A channel register for storing is added, and further, the teletext decoder is provided with a channel buffer for holding a channel number and a message storing section for storing data for displaying "searching for a table of contents of a specific channel" and the like. When the power is turned on or the channel is switched, the channel number data stored in the channel register is sent to the teletext decoder, and the teletext decoder holds the channel number data in the channel buffer each time. Can immediately display the channel number and the fact that the table of contents is being searched for on the screen.

As is clear from this, according to the present invention, the teletext decoder can immediately search the table-of-contents data when the power is turned on or when the channel is switched, and the user can see what channel of the table-of-contents is currently being searched. It is possible to display, and it is possible to obtain an extremely excellent effect such that the processing load of the teletext decoder can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a receiving and displaying apparatus of the present invention, FIG. 2 is a front view of a display screen obtained by the present invention, and FIG. 3 is a block diagram of a conventional example. 2 ... TV signal receiving / demodulating unit, 8 ... Video / audio switching unit,
9 ... Display unit, 10 ... Voice output unit, 11 ... Key input processing unit, 12 ... Channel register, 13 ... Text broadcasting decoder, 14 ... Channel buffer, 15 ... Key input unit, 16 ...
… Messer ROM [message storage]

Claims (1)

[Claims] 1. A television signal receiving / demodulating section for receiving and demodulating a television broadcast and outputting various signals such as a video signal, an audio signal, a video signal, a synchronizing signal, and a character / graphic processing for extracting a telecast signal from the video signal. A character that performs additional sound processing and outputs as a video signal and an audio signal, and further outputs a video signal and an audio signal from the TV broadcasting side and a switching signal that selects one of the video signal and the audio signal from the broadcasting side and specifies switching. A broadcast decoder section, a key input processing section and a key input section for making a key request to the television signal reception demodulation section and the teletext decoder section, and a channel register for storing channels of television broadcast and accessible by the key input processing section. A channel buffer temporarily holding the channel data from the key input processing unit and accessible from the teletext decoder unit, A message storage unit for storing display message data and accessible from the teletext decoder, and a video / audio switching unit for switching a video signal and an audio signal to either the television broadcasting side or the teletext side are provided, and when the power is turned on, When the channel is switched, the channel number data stored in the channel register is sent to the teletext decoder, and the teletext decoder holds it in the channel buffer each time, and when the channel is switched when the teletext is in use, the data in the message storage section is teletexted. A receiving and displaying apparatus characterized in that a decoder performs a decoding process to display a screen indicating that a channel has been switched and a channel that has been switched.